Comparison : Item # Z420565, Slotted Flat Head Machine Screws, National Coarse, Zinc Plated Steel (5/16"-18)
Item # Z420570, Slotted Flat Head Machine Screws, National Coarse, Zinc Plated Steel (5/16"-18)
Item # Z420575, Slotted Flat Head Machine Screws, National Coarse, Zinc Plated Steel (5/16"-18)
Item # Z420580, Slotted Flat Head Machine Screws, National Coarse, Zinc Plated Steel (5/16"-18)
Item # Z420585, Slotted Flat Head Machine Screws, National Coarse, Zinc Plated Steel (5/16"-18)